MPG accuracy??
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Super Member
Joined: Apr 2016
Posts: 515
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From: Hudson Valley, NY
2012 E350
MPG accuracy??
How accurate is the dash readout showing MPG? I went on a 130 mile trip yesterday and my car is telling me I got 29 MPG.
This from an 2012 E350. If it's true, that is better mileage than I get on my 2009 V6 Accord (I can count on 27 MPG on the highway from my Accord)
This from an 2012 E350. If it's true, that is better mileage than I get on my 2009 V6 Accord (I can count on 27 MPG on the highway from my Accord)
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Joined: Mar 2014
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From: West Central Florida
2011 E550 P2 4M Sedan
The readout in my 2011 E550 is always .5-1 mpg too generous compared to manual calc at fill up. It has never been under what I calculated. Even with that margin, that's still pretty good mileage. I get about 26mpg highway with the NAV8.
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From: Central Coast, CA
2020 X7 xDrive40i, 2016 X3 sDrive28i
Similar to thefisch, over 20k miles I've found the on board computer to be about 0.5 to 1 mpg too optimistic. That is, if it says 29 MPG, it's likely 28 to 28.5MPG. Still not bad for such a heavy car.
Best I've ever gotten on my E350 wagon was 31 mpg going 65mph on a 400 mile trip.
We plan to take it on a 2500 mile trip this summer, hoping to average close to 30, although with a full load of people and luggage as well as a roof cargo box, and lots of stops to see the sights, we may not get anywhere near 30.
Best I've ever gotten on my E350 wagon was 31 mpg going 65mph on a 400 mile trip.
We plan to take it on a 2500 mile trip this summer, hoping to average close to 30, although with a full load of people and luggage as well as a roof cargo box, and lots of stops to see the sights, we may not get anywhere near 30.
Super Member
Joined: Feb 2013
Posts: 580
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From: Maryland
2013 E550 4Matic
Agreed on ~1mpg optimistic. The best I've gotten in my 2013 550 is 32.1mpg (on the readout), and the best I had on my 2011 350 was 28mpg all highway for an entire tank. The best I get on my 2012 R1 is about 29 (lol...)
Overall very impressed with the V8 TT
Overall very impressed with the V8 TT
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Joined: Nov 2009
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From: Southeastern USA
2010 E350 Luxury Sedan, Engine 272 (V6)
My car is about 1 MPG pessimistic based on my testing in the past. One problem is that when it resets, it starts at about 22 MPG even if you are going down hill with foot off the accelerator. So it takes quite a few miles for it to truly reflect mileage.
My best was 34 on interstate at 65 MPH using cruise. Using cruise control will increase your mileage.
My best was 34 on interstate at 65 MPH using cruise. Using cruise control will increase your mileage.
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Junior Member
Joined: Apr 2014
Posts: 72
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2014 E250 BlueTec RWD, 2015 GLK250 (Sold), 2025 GLE450E (On Order 4 May)
on my 2014 E250 (diesel), I been tracking the mileage and since day one on a spreadsheet.
57300K miles
40.73 Ave MPG via math
43.2 Ave MPG per computer totals.
57300K miles
40.73 Ave MPG via math
43.2 Ave MPG per computer totals.
Senior Member
Joined: Aug 2014
Posts: 255
Likes: 36
From: Las Vegas
2012 E350 sedan
Common problem with almost all cars
It's been the case with every car I've owned the past 15 years. It is so prevalent that I've seen articles about it in some auto mags. There are some hacks so you can correct it but not worth the bother to me.
Thread Starter
Super Member
Joined: Apr 2016
Posts: 515
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From: Hudson Valley, NY
2012 E350
So today on a 65 mile highway ride, traveling roughly 65 mph, my readout at the end of the trip told me my mpg was 32.2
I just don't believe it is possible out of a 302 hp awd sedan that weighs 2 tons.
I just don't believe it is possible out of a 302 hp awd sedan that weighs 2 tons.
Thread Starter
Super Member
Joined: Apr 2016
Posts: 515
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From: Hudson Valley, NY
2012 E350
MBWorld Fanatic!
Joined: Nov 2009
Posts: 2,616
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From: Southeastern USA
2010 E350 Luxury Sedan, Engine 272 (V6)
Probable
Were you using cruise control? Surprising about how much this increases MPG. As posted above, I have gotten as much as 34 MPG at same speed on interstate.
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Joined: Oct 2013
Posts: 300
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From: GA, USA
Current: '19 E450 Cabriolet - Past: '19 C300 Coupe, '12 SLK350, '16 E350, '14 C250 (x2), '09 CLK350
So far I'm pretty happy with the mileage on my RWD E350.
Coming out of a C250 the mileage on that four banger was incredible. I was in mid thirties on long highway trips. But, that was a C and this is an E.
I'd be surprised to achieve that in the E350, which seems to fall somewhere between a gas sipper and a guzzler. I commute on back roads mostly to work and the MPG isn't too hot, probably low 20s.
Coming out of a C250 the mileage on that four banger was incredible. I was in mid thirties on long highway trips. But, that was a C and this is an E.
I'd be surprised to achieve that in the E350, which seems to fall somewhere between a gas sipper and a guzzler. I commute on back roads mostly to work and the MPG isn't too hot, probably low 20s.
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Joined: Feb 2004
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From: NY
2014 E350 4Matic
So far I'm pretty happy with the mileage on my RWD E350.
Coming out of a C250 the mileage on that four banger was incredible. I was in mid thirties on long highway trips. But, that was a C and this is an E.
I'd be surprised to achieve that in the E350, which seems to fall somewhere between a gas sipper and a guzzler. I commute on back roads mostly to work and the MPG isn't too hot, probably low 20s.
Coming out of a C250 the mileage on that four banger was incredible. I was in mid thirties on long highway trips. But, that was a C and this is an E.
I'd be surprised to achieve that in the E350, which seems to fall somewhere between a gas sipper and a guzzler. I commute on back roads mostly to work and the MPG isn't too hot, probably low 20s.
